Drupal core uses the third-party PEAR Archive_Tar library. This library has released a security update which impacts some Drupal configurations. Refer to CVE-2018-1000888 for details.
{ "constraint": ">= 8.0.0 <8.5.9" }
{ "constraint": ">=8.6.0 <8.6.6" }
">=7.0 <7.62 || >= 8.0.0 <8.5.9 || >=8.6.0 <8.6.6"
"https://github.com/DrupalSecurityTeam/drupal-advisory-database/blob/main/advisories/core/DRUPAL-CORE-2019-001.json"